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Finding the Fourth Proportional to 492.13, 679.25 and 285.25

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Solution

The fourth proportional to 492.13, 679.25 and 285.25 is: 393.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.13 : 679.25 = 285.25 : x
  2. Step 2: Convert to fraction form
    492.13/679.25 = 285.25/x
  3. Step 3: Cross multiply
    492.13x = 679.25 × 285.25
  4. Step 4: Simplify right side
    492.13x = 193,753.38
  5. Step 5: Solve for x
    x = 193,753.38/492.13
  6. Step 6: Final answer
    x = 393.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.